Couchdb example of using one document to index others, for alternate orders

orderexample

The order document specifies different orders of the same set of documents.
{
  "_id": "order",
  "_rev": "11-f5ddfed421c4cfcd24ab38ae74e34723",
  "zettelNoteType": "order",
  "order": [
    {
      "orderKey": "bpluly",
      "orderList": [
        "00000000-150d3af6-8e17-46e5-8da5-4bf7935e52ac",
        "00000000-18461272-bff0-4d41-af5e-847d90fef30f",
        "00000000-33ed3de9-d2a3-4a9e-a7bc-d72528e9ecf9",
        "00000000-41fd198e-7998-47b6-9fa7-1a8d6b122893",
        "00000000-453acc27-1306-471e-96ab-9c6260bc5704",
        "00000000-485905e6-d12b-46b1-b5bd-216a3cdb917d",
        "00000000-82dc2590-2042-4d2b-902c-5a70b67268f7",
        "00000000-a2e88c0f-8222-42ef-9090-24330d013fd4"
      ]
    },
    {
      "orderKey": "zettel_io",
      "orderList": [
        "00000000-82dc2590-2042-4d2b-902c-5a70b67268f7",
        "00000000-41fd198e-7998-47b6-9fa7-1a8d6b122893",
        "00000000-150d3af6-8e17-46e5-8da5-4bf7935e52ac",
        "00000000-18461272-bff0-4d41-af5e-847d90fef30f",
        "00000000-33ed3de9-d2a3-4a9e-a7bc-d72528e9ecf9",
        "00000000-453acc27-1306-471e-96ab-9c6260bc5704",
        "00000000-485905e6-d12b-46b1-b5bd-216a3cdb917d",
        "00000000-a2e88c0f-8222-42ef-9090-24330d013fd4"
      ]
    }
  ]
}

The view joins the order document to the documents in the lists.
function (doc) {
  if (doc.zettelNoteType=="order"){
    for (var i in doc.order){
        for (var j in doc.order[i].orderList){
          emit([doc.order[i].orderKey], {_id: doc.order[i].orderList[j]});
        }
    }
  }
}

And the answer thanks to @rnewson is to use startkey= and endkey= as in:
startkey=["zettel_io"]&endkey=["zettel_io"]